256 lines
5.8 KiB
C++
256 lines
5.8 KiB
C++
/*
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* \brief Implementation of Framebuffer and Input services
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* \author Norman Feske
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* \date 2006-09-22
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*/
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/*
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* Copyright (C) 2006-2012 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#include <base/env.h>
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#include <base/semaphore.h>
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#include <base/rpc_server.h>
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#include <cap_session/connection.h>
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#include <framebuffer_session/framebuffer_session.h>
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#include <input/component.h>
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#include "canvas_rgb565.h"
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#include "services.h"
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/*****************
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** Event queue **
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*****************/
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class Event_queue
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{
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private:
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enum { QUEUE_SIZE = 1024 };
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Input::Event _queue[QUEUE_SIZE];
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int _head;
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int _tail;
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Genode::Semaphore _sem;
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public:
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/**
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* Constructor
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*/
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Event_queue(): _head(0), _tail(0)
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{
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memset(_queue, 0, sizeof(_queue));
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}
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void post(Input::Event ev)
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{
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if ((_head + 1)%QUEUE_SIZE != _tail) {
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_queue[_head] = ev;
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_head = (_head + 1)%QUEUE_SIZE;
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_sem.up();
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}
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}
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Input::Event get()
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{
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_sem.down();
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Input::Event dst_ev = _queue[_tail];
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_tail = (_tail + 1)%QUEUE_SIZE;
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return dst_ev;
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}
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int pending() { return _head != _tail; }
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} _ev_queue;
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/***************************
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** Input service backend **
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***************************/
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namespace Input {
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void event_handling(bool enable) { }
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bool event_pending() { return _ev_queue.pending(); }
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Event get_event() { return _ev_queue.get(); }
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}
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class Window_content : public Element
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{
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private:
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class Content_event_handler : public Event_handler
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{
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private:
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Event_queue *_ev_queue;
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int _omx, _omy;
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Element *_element;
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public:
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Content_event_handler(Event_queue *ev_queue, Element *element):
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_ev_queue(ev_queue), _element(element) { }
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void handle(Event &ev)
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{
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int mx = ev.mx - _element->abs_x();
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int my = ev.my - _element->abs_y();
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int code = 0;
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if (ev.type == Event::PRESS || ev.type == Event::RELEASE)
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code = ev.code;
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Input::Event::Type type;
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type = (ev.type == Event::MOTION) ? Input::Event::MOTION
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: (ev.type == Event::PRESS) ? Input::Event::PRESS
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: (ev.type == Event::RELEASE) ? Input::Event::RELEASE
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: Input::Event::INVALID;
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if (type != Input::Event::INVALID)
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_ev_queue->post(Input::Event(type, code, mx, my, mx - _omx, my - _omy));
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_omx = mx;
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_omy = my;
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}
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};
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unsigned _fb_w, _fb_h;
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Genode::Attached_ram_dataspace _fb_ds;
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Pixel_rgb565 *_pixel;
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unsigned char *_alpha;
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Texture_rgb565 _fb_texture;
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Content_event_handler _ev_handler;
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public:
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Window_content(unsigned fb_w, unsigned fb_h, Event_queue *ev_queue,
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bool config_alpha)
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:
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_fb_w(fb_w), _fb_h(fb_h),
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_fb_ds(Genode::env()->ram_session(), _fb_w*_fb_h*sizeof(Pixel_rgb565)),
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_pixel(_fb_ds.local_addr<Pixel_rgb565>()),
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_alpha((unsigned char *)Genode::env()->heap()->alloc(_fb_w*_fb_h)),
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_fb_texture(_pixel, _alpha, _fb_w, _fb_h),
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_ev_handler(ev_queue, this)
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{
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_min_w = _fb_w;
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_min_h = _fb_h;
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int alpha_min = config_alpha ? 0 : 255;
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/* init alpha channel */
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for (unsigned y = 0; y < _fb_h; y++)
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for (unsigned x = 0; x < _fb_w; x++) {
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int v = (x * y + (_fb_w*_fb_h)/4) / _fb_w;
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v = v + (x + y)/2;
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int a = v & 0xff;
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if (v & 0x100)
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a = 255 - a;
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a += (dither_matrix[y % dither_size][x % dither_size] - 127) >> 4;
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_alpha[y*_fb_w + x] = Genode::max(alpha_min, Genode::min(a, 255));
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}
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event_handler(&_ev_handler);
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}
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/**
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* Accessors
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*/
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Genode::Dataspace_capability fb_ds_cap() { return _fb_ds.cap(); }
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unsigned fb_w() { return _fb_w; }
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unsigned fb_h() { return _fb_h; }
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/**
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* Element interface
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*/
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void draw(Canvas *c, int x, int y) {
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c->draw_texture(&_fb_texture, _x + x, _y + y); }
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};
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static Window_content *_window_content;
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Element *window_content() { return _window_content; }
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/***********************************************
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** Implementation of the framebuffer service **
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***********************************************/
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namespace Framebuffer
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{
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class Session_component : public Genode::Rpc_object<Session>
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{
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public:
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Genode::Dataspace_capability dataspace() { return _window_content->fb_ds_cap(); }
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Mode mode()
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{
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return Mode(_window_content->fb_w(), _window_content->fb_h(),
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Mode::RGB565);
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}
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void refresh(int x, int y, int w, int h) {
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window_content()->redraw_area(x, y, w, h); }
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};
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class Root : public Genode::Root_component<Session_component>
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{
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protected:
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Session_component *_create_session(const char *args) {
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PDBG("creating framebuffer session");
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return new (md_alloc()) Session_component(); }
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public:
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Root(Genode::Rpc_entrypoint *session_ep,
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Genode::Allocator *md_alloc)
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: Genode::Root_component<Session_component>(session_ep, md_alloc) { }
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};
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}
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void init_services(unsigned fb_w, unsigned fb_h, bool config_alpha)
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{
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using namespace Genode;
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static Window_content content(fb_w, fb_h, &_ev_queue, config_alpha);
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_window_content = &content;
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/*
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* Initialize server entry point
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*/
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enum { STACK_SIZE = 4096 };
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static Cap_connection cap;
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static Rpc_entrypoint ep(&cap, STACK_SIZE, "liquid_fb_ep");
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/*
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* Let the entry point serve the framebuffer and input root interfaces
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*/
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static Framebuffer::Root fb_root(&ep, env()->heap());
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static Input::Root input_root(&ep, env()->heap());
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/*
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* Now, the root interfaces are ready to accept requests.
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* This is the right time to tell mummy about our services.
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*/
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env()->parent()->announce(ep.manage(&fb_root));
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env()->parent()->announce(ep.manage(&input_root));
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}
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